Bendis only cared about his characters and his favorites, pissed on everything that came before him, never gave a single thought to existing continuity, and poisoned decades worth of existing heroes for his own plots. He was horrible for Marvel and their willingness to let him jump from one corner to another of their universe just spread the bile and poison around. He is the chief reason that there is no more continuity in the 616. On top of it all, he spoke as if the comic medium never existed until he arrived.
Good riddance to bad things. My sympathy to DC.
He doesn't own them, and he hasn't created many. How did he ruin continuity? His run on The Avengers might have actually used TOO much continuity (There was stuff in there that I wasn't even familiar with.). As to using favorites, pretty much all writers seem to do that. I guess that Claremont's Uncanny or Frank Miller's Daredevil run should be bad then, too.